Tuyere



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G. W. VREELAN TUYRE Filed July 8, 1927 (y E T \/0 i Am m r 4,?

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Patented Sept. 4, 1928.l

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Application filed July e,

f'his invention relates to blast furnace tuyres, and has for its primary object the provision of a tuyere having an improved form of nose which vvill not burn avvay or be destroyed as readily as the tuyeres heretofore commonly used.

ldleretofore, tuyeres composed entirely of bronze or copper, or having body portions composed of bronze or copper and having `tlnirnose portions composed yof refractory material have generally been used in blast furnaces. 'fuyeres having their nose portions com osed of refractory material have a relativefy longer life than those composed vvholly of copper or bronze. l-lovvever, experience has shovvn that even the refractory nose tuyeres last, but a short time,due to the fact that the refractory material becomes rapidly eroded by the blast and slagging action leaving the ragged bronze or copper shell which previously contained the refractory material. The destruction of the refractory .nose of the tuyere shortens the length of the tuyre so as to lessen its edsctiveness and also permits the intense heat of' the furnace to act directly on the tuyre body so that the tuyre is readily destroyed.

lhe present invention overcomes the objections to the all bronze or copper tuyres and the refr-actor' nose tuyere, by providing a nose portion Which-will withstand higher temperatures than the bronze or copper of the tuyre body, and Which will conduct heat avvay from the nose much faster than is possible with refractory material.V

ln the drawings- Figure l is a plan view of the outer or rear end of a tuyre constructed in accordance with this invention. y

fligure 2 is a plan view of the inner or nose end thereof.

Figure 3 is a sectional elevation on the line lll-Hl of l'igure l.

fiigure l is an enlarged. sectional View through the nose end of the tuyre.

lleferring more particularly to the drawings, the numeral 2 designates the body of the tuyre as a Whole, which is preferably composed of bronze or copper, and cast integral. rihc body 2 is of the usual tapering cylindrical construction, having the annular water-jacket 3. il vfater inlet 4 and a Water outlet 5 .are provided into which are thread- 192'?. Serial No. @04,356

ed the usual Water inlet and outlet pipes (not shown). ln order to facilitate the removal of the core used in casting thel hollow vvater- ]aclretor recess 3, ports 6 are provided in the rear Wall of the tuyre which ports are closed by threaded plugs 7. I

rl'he tuyere nose is provided vvith a cast iron nose ring 8 "which is preformed and cast into the nose of the tuyre so that it is held in position by extensions 9 and l() of the -side 'Walls of the tuyre body.

The ring 8 has its nose end reduced in thicknessa to form shoulders l2 and has its outer circumference grooved 'to form retainlng ridges or rings la. 'lhe extensions 9 and l0 of the side Walls of the tuyre, as stated above, are cast around-the ring 8 and so interlit With the irregular outline of the cast iron nose ring 9 and securely hold it 1n place.

The nose end of the ring 9 extends through the nose end of the tuyre so as to form a continuous Wear ring.

Cast iron has a. much higher melting tem-` perature than either bronze or copper and also has a less coefficient of expansion than either bronze or copper. Therefore the cast iron Will be affected less by the high temperatures of the blast furnace and, further, will expand to a'less degree than the bronze or cop er walls 9' and l0 of the nose ortion, so t at there `Will be no danger of t e fracture of said Walls by the expansion of the cast iron ring.

The cast iron ring 8 being in direct'contact Withthe bronze or copper body of the tuyre will rapidly conduct the heat from the nose to the lWater in the Water-jacket 3 therefore maintaining the temperature of the nose below the, destructive temperatures, and the cast iron, due to its inherent qualities, will be less lilrely to be corroded and Worn away by the slagging action of the furnace, therefore resulting in a longer life for the tuyre and also in maintaining the tuyre at its maximum length for a greater time than is possible vvith tuyres of the prior art. y

WV-hile ll have shovvn and described one specific embodiment of my invention, it will be understood that l" do not Wish to be limited thereto since various modifications may be made Without departing from the fill dit

scope of my invention as defined in the appended claims. For example, While .cast iron preferably is used for making the nose ring, other metals such as nickel and steel may be employed.

1 claim- 1. A blast furnace tuyre comprising a cylindrical body portion having an annular Water-jacket formed therein, and a solid nose portion formed on said tuyre, said nose portion being,r composed of a -shell formed integral with the body of the tuyre, and a cast iron ring:r Within said shell.

2. A blast furnace tuyre comprising a eylindrical body portion having;r `an annular Water-jacket formed therein, and a solid nose portion formed on said tuyre, said nose portion being composed of a shell formed from extensions of the side Walls of said tuyre, and a cast iron center mounted Within said shell.

3. A blast furnace tuyre comprising a eylindrical body portion having an annular water-jacket formed therein, and a solid nose portion formed on said tuyre, said nose GEO. W. VREELAND. 

